Algebra Demystified 2nd Ed

358 alGEbra De mystif ieD

4. −0.1x^2 + 1.1x − 2.8 = 0
   5.^1
   5

1

5

xx^2 +−= 60

6.^1
6

2

3

16

3

xx^2 −−= 0

7. xx^21
   2

−−= 30

8. −+^3 +=
   2

1

2

xx^210

9. 6x^2 + 18 x − 24 = 0


10. − 10 x^2 − 34 x − 12 = 0

✔SOLUTIONS

1. −−+=
   −− −+ =−
   +− =
   +−=

xx

xx

xx

xx

x

2

2

2

30 0

30 0

30 0

650

()

()()

660 50

66

=−=

−−

x

++

=− =

55

xx 65      

2. −+=
   −− +=−
   −=
   −+=
   −

9250

9250

9250

35350

3

2

2

2

x

x

x

xx

x

()

()()

550 350

55

=+=

++

x

−−

==−

==−

55

35 35

5

3

5

3

xx

xx